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US launches 'most advanced' stealth sub amid undersea rivalryBy Zachary Cohen, CNNUpdated 1:28 AM ET, Thu October 26, 2017 For years, the US has maintained a technological edge over the submarines developed by rival nations Virginia-class submarines currently cost roughly $2.7 billion eachWashington (CNN)Touted as the world's most technologically advanced fast attack submarine, the USS South Dakota is set to join the US Navy fleet amid a growing threat to American undersea dominance from several foreign rivals.Operating beneath the ocean's surface, a submarine's strategic value is often tied directly to its ability to navigate in or near enemy waters without being detected to conduct reconnaissance or attack missions.For years, the United States has maintained a technological edge over the submarines developed by rival nations, but recent advances made by Russia and China have sparked concerns of an emerging threat to American undersea superiority. Read more at: http://www.cnn.com/2017/10/26/politics/navy-uss-south-dakota-submarine-china-russia/index.html